# Envelope

- [Walls](/user-guide/2d-building/envelope/walls.md)
- [Roofs](/user-guide/2d-building/envelope/roofs.md)
- [Floors](/user-guide/2d-building/envelope/floors.md)
- [Windows](/user-guide/2d-building/envelope/windows.md)
- [Skylights](/user-guide/2d-building/envelope/skylights.md)
- [Glazed Doors](/user-guide/2d-building/envelope/glazed-doors.md)
- [Opaque Doors](/user-guide/2d-building/envelope/opaque-doors.md)
- [Shading](/user-guide/2d-building/envelope/shading.md)
- [Add Local Shading](/user-guide/2d-building/envelope/shading/add-local-shading.md)